Size.php

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<?php
namespace Magento\Framework\File;

class Size
{
    private $dataSize;

    protected static $_maxFileSize = -1;

    public function getPostMaxSize()
    {
        return $this->_iniGet('post_max_size');
    }

    public function getUploadMaxSize()
    {
        return $this->_iniGet('upload_max_filesize');
    }

    public function getMaxFileSizeInMb($precision = 0, $mode = \PHP_ROUND_HALF_DOWN)
    {
        return $this->getFileSizeInMb($this->getMaxFileSize(), $precision, $mode);
    }

    public function getFileSizeInMb($fileSize, $precision = 0, $mode = \PHP_ROUND_HALF_DOWN)
    {
        return round($fileSize / (1024 * 1024), $precision, $mode);
    }

    public function getMaxFileSize()
    {
        if (self::$_maxFileSize < 0) {
            $postMaxSize = $this->getDataSize()->convertSizeToBytes($this->getPostMaxSize());
            $uploadMaxSize = $this->getDataSize()->convertSizeToBytes($this->getUploadMaxSize());
            $min = max($postMaxSize, $uploadMaxSize);

            if ($postMaxSize > 0) {
                $min = min($min, $postMaxSize);
            }

            if ($uploadMaxSize > 0) {
                $min = min($min, $uploadMaxSize);
            }

            self::$_maxFileSize = $min;
        }

        return self::$_maxFileSize;
    }

    public function convertSizeToInteger($size)
    {
        return $this->getDataSize()->convertSizeToBytes($size);
    }

    protected function _iniGet($param)
    {
        return trim(ini_get($param));
    }

    private function getDataSize()
    {
        if ($this->dataSize === null) {
            $this->dataSize =
                \Magento\Framework\App\ObjectManager::getInstance()->get(\Magento\Framework\Convert\DataSize::class);
        }

        return $this->dataSize;
    }
}